In 2016, a lot of people left something behind in their Uber on Halloween weekend:

More people were absent-minded on October 30 and December 11 than any other days of the year. Saturday and Sunday are the days when people lose the most stuff — again, these are the days when it seems people take Ubers most frequently. Uber did say that it sees an increase in lost plane tickets on Saturdays and lost wedding dresses on Sundays.

The real treasure, though, is the company's roundup of the "most unique" items abandoned in Ubers: